I think apart from the scale, they view labor as a risk, rather than an asset. The ironic part to me is they're hiring "genius" level talent to create these dummy level algorithms.
1. X = CreateResource()
2. Y = TransformResource(X)
3. ProcessNewResource(Y)
4. Z = TransformResource(Y)
5. etc. etc.
And so as you transform that resource, you will have multiple ways to unwind the resource depending on where the failure occurs. Even if you wrap X in some RAII container, you don't know what your destructor is going to look like.